Perhaps you should try some spelling variations:
"supply chain irrigation schemes." » "supply chain irrigation scheme.", "supply chain irrigation systems.", "supply grain irrigation schemes.", "supply change irrigation schemes.", "supply basin irrigation schemes."
"Supply ocean conservation efforts." » "Supply ocean observation efforts.", "Supply local conservation efforts.", "Supply area conservation efforts."
supply ocean » supply oecd, supply chai

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply chain irrigation schemes.") or ("Supply ocean conservation efforts."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply chain irrigation schemes.") OR ("Supply ocean conservation efforts.")).
• Removing quotes may allow a broader search: (( supply chain irrigation schemes. ) or ( Supply ocean conservation efforts. )).
• Adding a wildcard symbol may retrieve word variants: (("supply chain irrigation schemes.") or ("Supply ocean conservation efforts."))*.